Initial checkin from CRI-O repo

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>

4 files changed, 744 insertions, 0 deletions

diff --git a/vendor/github.com/google/gofuzz/LICENSE b/vendor/github.com/google/gofuzz/LICENSE
new file mode 100644
index 000000000..d64569567
--- /dev/null
+++ b/vendor/github.com/google/gofuzz/LICENSE
@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
diff --git a/vendor/github.com/google/gofuzz/README.md b/vendor/github.com/google/gofuzz/README.md
new file mode 100644
index 000000000..64869af34
--- /dev/null
+++ b/vendor/github.com/google/gofuzz/README.md
@@ -0,0 +1,71 @@
+gofuzz
+======
+
+gofuzz is a library for populating go objects with random values.
+
+[![GoDoc](https://godoc.org/github.com/google/gofuzz?status.png)](https://godoc.org/github.com/google/gofuzz)
+[![Travis](https://travis-ci.org/google/gofuzz.svg?branch=master)](https://travis-ci.org/google/gofuzz)
+
+This is useful for testing:
+
+* Do your project's objects really serialize/unserialize correctly in all cases?
+* Is there an incorrectly formatted object that will cause your project to panic?
+
+Import with ```import "github.com/google/gofuzz"```
+
+You can use it on single variables:
+```go
+f := fuzz.New()
+var myInt int
+f.Fuzz(&myInt) // myInt gets a random value.
+```
+
+You can use it on maps:
+```go
+f := fuzz.New().NilChance(0).NumElements(1, 1)
+var myMap map[ComplexKeyType]string
+f.Fuzz(&myMap) // myMap will have exactly one element.
+```
+
+Customize the chance of getting a nil pointer:
+```go
+f := fuzz.New().NilChance(.5)
+var fancyStruct struct {
+  A, B, C, D *string
+}
+f.Fuzz(&fancyStruct) // About half the pointers should be set.
+```
+
+You can even customize the randomization completely if needed:
+```go
+type MyEnum string
+const (
+        A MyEnum = "A"
+        B MyEnum = "B"
+)
+type MyInfo struct {
+        Type MyEnum
+        AInfo *string
+        BInfo *string
+}
+
+f := fuzz.New().NilChance(0).Funcs(
+        func(e *MyInfo, c fuzz.Continue) {
+                switch c.Intn(2) {
+                case 0:
+                        e.Type = A
+                        c.Fuzz(&e.AInfo)
+                case 1:
+                        e.Type = B
+                        c.Fuzz(&e.BInfo)
+                }
+        },
+)
+
+var myObject MyInfo
+f.Fuzz(&myObject) // Type will correspond to whether A or B info is set.
+```
+
+See more examples in ```example_test.go```.
+
+Happy testing!
diff --git a/vendor/github.com/google/gofuzz/doc.go b/vendor/github.com/google/gofuzz/doc.go
new file mode 100644
index 000000000..9f9956d4a
--- /dev/null
+++ b/vendor/github.com/google/gofuzz/doc.go
@@ -0,0 +1,18 @@
+/*
+Copyright 2014 Google Inc. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Package fuzz is a library for populating go objects with random values.
+package fuzz
diff --git a/vendor/github.com/google/gofuzz/fuzz.go b/vendor/github.com/google/gofuzz/fuzz.go
new file mode 100644
index 000000000..4f888fbc8
--- /dev/null
+++ b/vendor/github.com/google/gofuzz/fuzz.go
@@ -0,0 +1,453 @@
+/*
+Copyright 2014 Google Inc. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package fuzz
+
+import (
+	"fmt"
+	"math/rand"
+	"reflect"
+	"time"
+)
+
+// fuzzFuncMap is a map from a type to a fuzzFunc that handles that type.
+type fuzzFuncMap map[reflect.Type]reflect.Value
+
+// Fuzzer knows how to fill any object with random fields.
+type Fuzzer struct {
+	fuzzFuncs        fuzzFuncMap
+	defaultFuzzFuncs fuzzFuncMap
+	r                *rand.Rand
+	nilChance        float64
+	minElements      int
+	maxElements      int
+}
+
+// New returns a new Fuzzer. Customize your Fuzzer further by calling Funcs,
+// RandSource, NilChance, or NumElements in any order.
+func New() *Fuzzer {
+	f := &Fuzzer{
+		defaultFuzzFuncs: fuzzFuncMap{
+			reflect.TypeOf(&time.Time{}): reflect.ValueOf(fuzzTime),
+		},
+
+		fuzzFuncs:   fuzzFuncMap{},
+		r:           rand.New(rand.NewSource(time.Now().UnixNano())),
+		nilChance:   .2,
+		minElements: 1,
+		maxElements: 10,
+	}
+	return f
+}
+
+// Funcs adds each entry in fuzzFuncs as a custom fuzzing function.
+//
+// Each entry in fuzzFuncs must be a function taking two parameters.
+// The first parameter must be a pointer or map. It is the variable that
+// function will fill with random data. The second parameter must be a
+// fuzz.Continue, which will provide a source of randomness and a way
+// to automatically continue fuzzing smaller pieces of the first parameter.
+//
+// These functions are called sensibly, e.g., if you wanted custom string
+// fuzzing, the function `func(s *string, c fuzz.Continue)` would get
+// called and passed the address of strings. Maps and pointers will always
+// be made/new'd for you, ignoring the NilChange option. For slices, it
+// doesn't make much sense to  pre-create them--Fuzzer doesn't know how
+// long you want your slice--so take a pointer to a slice, and make it
+// yourself. (If you don't want your map/pointer type pre-made, take a
+// pointer to it, and make it yourself.) See the examples for a range of
+// custom functions.
+func (f *Fuzzer) Funcs(fuzzFuncs ...interface{}) *Fuzzer {
+	for i := range fuzzFuncs {
+		v := reflect.ValueOf(fuzzFuncs[i])
+		if v.Kind() != reflect.Func {
+			panic("Need only funcs!")
+		}
+		t := v.Type()
+		if t.NumIn() != 2 || t.NumOut() != 0 {
+			panic("Need 2 in and 0 out params!")
+		}
+		argT := t.In(0)
+		switch argT.Kind() {
+		case reflect.Ptr, reflect.Map:
+		default:
+			panic("fuzzFunc must take pointer or map type")
+		}
+		if t.In(1) != reflect.TypeOf(Continue{}) {
+			panic("fuzzFunc's second parameter must be type fuzz.Continue")
+		}
+		f.fuzzFuncs[argT] = v
+	}
+	return f
+}
+
+// RandSource causes f to get values from the given source of randomness.
+// Use if you want deterministic fuzzing.
+func (f *Fuzzer) RandSource(s rand.Source) *Fuzzer {
+	f.r = rand.New(s)
+	return f
+}
+
+// NilChance sets the probability of creating a nil pointer, map, or slice to
+// 'p'. 'p' should be between 0 (no nils) and 1 (all nils), inclusive.
+func (f *Fuzzer) NilChance(p float64) *Fuzzer {
+	if p < 0 || p > 1 {
+		panic("p should be between 0 and 1, inclusive.")
+	}
+	f.nilChance = p
+	return f
+}
+
+// NumElements sets the minimum and maximum number of elements that will be
+// added to a non-nil map or slice.
+func (f *Fuzzer) NumElements(atLeast, atMost int) *Fuzzer {
+	if atLeast > atMost {
+		panic("atLeast must be <= atMost")
+	}
+	if atLeast < 0 {
+		panic("atLeast must be >= 0")
+	}
+	f.minElements = atLeast
+	f.maxElements = atMost
+	return f
+}
+
+func (f *Fuzzer) genElementCount() int {
+	if f.minElements == f.maxElements {
+		return f.minElements
+	}
+	return f.minElements + f.r.Intn(f.maxElements-f.minElements+1)
+}
+
+func (f *Fuzzer) genShouldFill() bool {
+	return f.r.Float64() > f.nilChance
+}
+
+// Fuzz recursively fills all of obj's fields with something random.  First
+// this tries to find a custom fuzz function (see Funcs).  If there is no
+// custom function this tests whether the object implements fuzz.Interface and,
+// if so, calls Fuzz on it to fuzz itself.  If that fails, this will see if
+// there is a default fuzz function provided by this package.  If all of that
+// fails, this will generate random values for all primitive fields and then
+// recurse for all non-primitives.
+//
+// Not safe for cyclic or tree-like structs!
+//
+// obj must be a pointer. Only exported (public) fields can be set (thanks, golang :/ )
+// Intended for tests, so will panic on bad input or unimplemented fields.
+func (f *Fuzzer) Fuzz(obj interface{}) {
+	v := reflect.ValueOf(obj)
+	if v.Kind() != reflect.Ptr {
+		panic("needed ptr!")
+	}
+	v = v.Elem()
+	f.doFuzz(v, 0)
+}
+
+// FuzzNoCustom is just like Fuzz, except that any custom fuzz function for
+// obj's type will not be called and obj will not be tested for fuzz.Interface
+// conformance.  This applies only to obj and not other instances of obj's
+// type.
+// Not safe for cyclic or tree-like structs!
+// obj must be a pointer. Only exported (public) fields can be set (thanks, golang :/ )
+// Intended for tests, so will panic on bad input or unimplemented fields.
+func (f *Fuzzer) FuzzNoCustom(obj interface{}) {
+	v := reflect.ValueOf(obj)
+	if v.Kind() != reflect.Ptr {
+		panic("needed ptr!")
+	}
+	v = v.Elem()
+	f.doFuzz(v, flagNoCustomFuzz)
+}
+
+const (
+	// Do not try to find a custom fuzz function.  Does not apply recursively.
+	flagNoCustomFuzz uint64 = 1 << iota
+)
+
+func (f *Fuzzer) doFuzz(v reflect.Value, flags uint64) {
+	if !v.CanSet() {
+		return
+	}
+
+	if flags&flagNoCustomFuzz == 0 {
+		// Check for both pointer and non-pointer custom functions.
+		if v.CanAddr() && f.tryCustom(v.Addr()) {
+			return
+		}
+		if f.tryCustom(v) {
+			return
+		}
+	}
+
+	if fn, ok := fillFuncMap[v.Kind()]; ok {
+		fn(v, f.r)
+		return
+	}
+	switch v.Kind() {
+	case reflect.Map:
+		if f.genShouldFill() {
+			v.Set(reflect.MakeMap(v.Type()))
+			n := f.genElementCount()
+			for i := 0; i < n; i++ {
+				key := reflect.New(v.Type().Key()).Elem()
+				f.doFuzz(key, 0)
+				val := reflect.New(v.Type().Elem()).Elem()
+				f.doFuzz(val, 0)
+				v.SetMapIndex(key, val)
+			}
+			return
+		}
+		v.Set(reflect.Zero(v.Type()))
+	case reflect.Ptr:
+		if f.genShouldFill() {
+			v.Set(reflect.New(v.Type().Elem()))
+			f.doFuzz(v.Elem(), 0)
+			return
+		}
+		v.Set(reflect.Zero(v.Type()))
+	case reflect.Slice:
+		if f.genShouldFill() {
+			n := f.genElementCount()
+			v.Set(reflect.MakeSlice(v.Type(), n, n))
+			for i := 0; i < n; i++ {
+				f.doFuzz(v.Index(i), 0)
+			}
+			return
+		}
+		v.Set(reflect.Zero(v.Type()))
+	case reflect.Array:
+		if f.genShouldFill() {
+			n := v.Len()
+			for i := 0; i < n; i++ {
+				f.doFuzz(v.Index(i), 0)
+			}
+			return
+		}
+		v.Set(reflect.Zero(v.Type()))
+	case reflect.Struct:
+		for i := 0; i < v.NumField(); i++ {
+			f.doFuzz(v.Field(i), 0)
+		}
+	case reflect.Chan:
+		fallthrough
+	case reflect.Func:
+		fallthrough
+	case reflect.Interface:
+		fallthrough
+	default:
+		panic(fmt.Sprintf("Can't handle %#v", v.Interface()))
+	}
+}
+
+// tryCustom searches for custom handlers, and returns true iff it finds a match
+// and successfully randomizes v.
+func (f *Fuzzer) tryCustom(v reflect.Value) bool {
+	// First: see if we have a fuzz function for it.
+	doCustom, ok := f.fuzzFuncs[v.Type()]
+	if !ok {
+		// Second: see if it can fuzz itself.
+		if v.CanInterface() {
+			intf := v.Interface()
+			if fuzzable, ok := intf.(Interface); ok {
+				fuzzable.Fuzz(Continue{f: f, Rand: f.r})
+				return true
+			}
+		}
+		// Finally: see if there is a default fuzz function.
+		doCustom, ok = f.defaultFuzzFuncs[v.Type()]
+		if !ok {
+			return false
+		}
+	}
+
+	switch v.Kind() {
+	case reflect.Ptr:
+		if v.IsNil() {
+			if !v.CanSet() {
+				return false
+			}
+			v.Set(reflect.New(v.Type().Elem()))
+		}
+	case reflect.Map:
+		if v.IsNil() {
+			if !v.CanSet() {
+				return false
+			}
+			v.Set(reflect.MakeMap(v.Type()))
+		}
+	default:
+		return false
+	}
+
+	doCustom.Call([]reflect.Value{v, reflect.ValueOf(Continue{
+		f:    f,
+		Rand: f.r,
+	})})
+	return true
+}
+
+// Interface represents an object that knows how to fuzz itself.  Any time we
+// find a type that implements this interface we will delegate the act of
+// fuzzing itself.
+type Interface interface {
+	Fuzz(c Continue)
+}
+
+// Continue can be passed to custom fuzzing functions to allow them to use
+// the correct source of randomness and to continue fuzzing their members.
+type Continue struct {
+	f *Fuzzer
+
+	// For convenience, Continue implements rand.Rand via embedding.
+	// Use this for generating any randomness if you want your fuzzing
+	// to be repeatable for a given seed.
+	*rand.Rand
+}
+
+// Fuzz continues fuzzing obj. obj must be a pointer.
+func (c Continue) Fuzz(obj interface{}) {
+	v := reflect.ValueOf(obj)
+	if v.Kind() != reflect.Ptr {
+		panic("needed ptr!")
+	}
+	v = v.Elem()
+	c.f.doFuzz(v, 0)
+}
+
+// FuzzNoCustom continues fuzzing obj, except that any custom fuzz function for
+// obj's type will not be called and obj will not be tested for fuzz.Interface
+// conformance.  This applies only to obj and not other instances of obj's
+// type.
+func (c Continue) FuzzNoCustom(obj interface{}) {
+	v := reflect.ValueOf(obj)
+	if v.Kind() != reflect.Ptr {
+		panic("needed ptr!")
+	}
+	v = v.Elem()
+	c.f.doFuzz(v, flagNoCustomFuzz)
+}
+
+// RandString makes a random string up to 20 characters long. The returned string
+// may include a variety of (valid) UTF-8 encodings.
+func (c Continue) RandString() string {
+	return randString(c.Rand)
+}
+
+// RandUint64 makes random 64 bit numbers.
+// Weirdly, rand doesn't have a function that gives you 64 random bits.
+func (c Continue) RandUint64() uint64 {
+	return randUint64(c.Rand)
+}
+
+// RandBool returns true or false randomly.
+func (c Continue) RandBool() bool {
+	return randBool(c.Rand)
+}
+
+func fuzzInt(v reflect.Value, r *rand.Rand) {
+	v.SetInt(int64(randUint64(r)))
+}
+
+func fuzzUint(v reflect.Value, r *rand.Rand) {
+	v.SetUint(randUint64(r))
+}
+
+func fuzzTime(t *time.Time, c Continue) {
+	var sec, nsec int64
+	// Allow for about 1000 years of random time values, which keeps things
+	// like JSON parsing reasonably happy.
+	sec = c.Rand.Int63n(1000 * 365 * 24 * 60 * 60)
+	c.Fuzz(&nsec)
+	*t = time.Unix(sec, nsec)
+}
+
+var fillFuncMap = map[reflect.Kind]func(reflect.Value, *rand.Rand){
+	reflect.Bool: func(v reflect.Value, r *rand.Rand) {
+		v.SetBool(randBool(r))
+	},
+	reflect.Int:     fuzzInt,
+	reflect.Int8:    fuzzInt,
+	reflect.Int16:   fuzzInt,
+	reflect.Int32:   fuzzInt,
+	reflect.Int64:   fuzzInt,
+	reflect.Uint:    fuzzUint,
+	reflect.Uint8:   fuzzUint,
+	reflect.Uint16:  fuzzUint,
+	reflect.Uint32:  fuzzUint,
+	reflect.Uint64:  fuzzUint,
+	reflect.Uintptr: fuzzUint,
+	reflect.Float32: func(v reflect.Value, r *rand.Rand) {
+		v.SetFloat(float64(r.Float32()))
+	},
+	reflect.Float64: func(v reflect.Value, r *rand.Rand) {
+		v.SetFloat(r.Float64())
+	},
+	reflect.Complex64: func(v reflect.Value, r *rand.Rand) {
+		panic("unimplemented")
+	},
+	reflect.Complex128: func(v reflect.Value, r *rand.Rand) {
+		panic("unimplemented")
+	},
+	reflect.String: func(v reflect.Value, r *rand.Rand) {
+		v.SetString(randString(r))
+	},
+	reflect.UnsafePointer: func(v reflect.Value, r *rand.Rand) {
+		panic("unimplemented")
+	},
+}
+
+// randBool returns true or false randomly.
+func randBool(r *rand.Rand) bool {
+	if r.Int()&1 == 1 {
+		return true
+	}
+	return false
+}
+
+type charRange struct {
+	first, last rune
+}
+
+// choose returns a random unicode character from the given range, using the
+// given randomness source.
+func (r *charRange) choose(rand *rand.Rand) rune {
+	count := int64(r.last - r.first)
+	return r.first + rune(rand.Int63n(count))
+}
+
+var unicodeRanges = []charRange{
+	{' ', '~'},           // ASCII characters
+	{'\u00a0', '\u02af'}, // Multi-byte encoded characters
+	{'\u4e00', '\u9fff'}, // Common CJK (even longer encodings)
+}
+
+// randString makes a random string up to 20 characters long. The returned string
+// may include a variety of (valid) UTF-8 encodings.
+func randString(r *rand.Rand) string {
+	n := r.Intn(20)
+	runes := make([]rune, n)
+	for i := range runes {
+		runes[i] = unicodeRanges[r.Intn(len(unicodeRanges))].choose(r)
+	}
+	return string(runes)
+}
+
+// randUint64 makes random 64 bit numbers.
+// Weirdly, rand doesn't have a function that gives you 64 random bits.
+func randUint64(r *rand.Rand) uint64 {
+	return uint64(r.Uint32())<<32 | uint64(r.Uint32())
+}